Here in WA state, the state had a delegation that went to China in Oct 2019, myself, spouse and many in our area had what we thought was worst flu of our lives in Nov 2019, took a good 6 weeks to get energy back. We had many friends up north in BC that were also getting the "flu", many of us think now it was actually the covid or whatever WA state trade delegation brought back.
https://www.commerce.wa.gov/news-releases/washington-state-trade-delegation-heads-to-china/
First Case of 2019 Novel Coronavirus in the United States - https://www.nejm.org/doi/full/10.1056/NEJMoa2001191